<!DOCTYPE html>
<html>
      <head>
            <meta charset="utf-8">
            <meta name="viewport" content="width=device-width,initial-scale=1">
            <title>面包屑</title>
            <link rel="stylesheet" href="https://cdn.staticfile.net/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
            <script src="https://cdn.staticfile.net/jquery/3.2.1/jquery.min.js"></script>
            <script src="https://cdn.staticfile.net/popper.js/1.15.0/umd/popper.min.js"></script>
            <script src="https://cdn.staticfile.net/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
      </head>
      <body>
            <div class="container-fluid">
                  <!-- 面包屑使用ol实现 -->
                  <ol class="breadcrumb">
                        <li class="breadcrumb-item">面包屑1</li>
                  </ol>
                  <ol class="breadcrumb">
                        <li class="breadcrumb-item">面包屑1</li>
                        <li class="breadcrumb-item">面包屑2</li>
                  </ol>
                  <ol class="breadcrumb">
                        <li class="breadcrumb-item">面包屑1</li>
                        <li class="breadcrumb-item">面包屑2</li>
                        <li class="breadcrumb-item">面包屑3</li>
                  </ol>

                  <!-- 面包屑用nav和a标签实现 -->
                  <nav class="breadcrumb">
                        <a class="breadcrumb-item" href="#">面包屑1</a>
                        <a class="breadcrumb-item" href="#">面包屑2</a>
                        <a class="breadcrumb-item" href="#">面包屑3</a>
                  </nav>
            </div>
      </body>
</html>